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Yen, Teh Fu; Chilingar, George V. (1976). Oil Shale. Amsterdam: Elsevier. pp. 4–5, 28. ISBN 978-0-444-41408-3. Retrieved 2009-07-06. 978-0-444-41408-3
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Yen, Teh Fu; Chilingar, George V. (1976). Oil Shale. Amsterdam: Elsevier. pp. 4–5, 28. ISBN 978-0-444-41408-3. Retrieved 2009-07-06. 978-0-444-41408-3